Asexual people have zero drive, the to the point that they only have sex because of either trying to fit into social expectations or because they are in a relationship where they are trying to meet their partner’s drive. They personally are not sexually attracted to anyone.

None is different from the categories of (in general) opposite, same, and all.

On that note, even things like straight are fuzzy because a man being attracted to a very feminine man in drag can consider themselves straight or not depending on whether they see someone as a woman because of presentation or genitalia or a combination of both. But not being sexually attracted to anyone or not having a sex drive at all is significantly different and is worth including.